Revert of Animations: Port ProgrammaticScrollAnimator to use compositor timelines

Source/platform/scroll/ProgrammaticScrollAnimator.h

Index: Source/platform/scroll/ProgrammaticScrollAnimator.h
diff --git a/Source/platform/scroll/ProgrammaticScrollAnimator.h b/Source/platform/scroll/ProgrammaticScrollAnimator.h
index 9ee87562a7aa39b9067e82a33f122d8e2fb4753d..d3813a33eb54555fc19179f72864ed75820add85 100644
--- a/Source/platform/scroll/ProgrammaticScrollAnimator.h
+++ b/Source/platform/scroll/ProgrammaticScrollAnimator.h
@@ -6,8 +6,6 @@
 #define ProgrammaticScrollAnimator_h
 
 #include "platform/geometry/FloatPoint.h"
-#include "public/platform/WebCompositorAnimationDelegate.h"
-#include "public/platform/WebCompositorAnimationPlayerClient.h"
 #include "wtf/FastAllocBase.h"
 #include "wtf/Noncopyable.h"
 #include "wtf/OwnPtr.h"
@@ -16,13 +14,11 @@
 namespace blink {
 
 class ScrollableArea;
-class WebCompositorAnimationPlayer;
-class WebCompositorAnimationTimeline;
 class WebScrollOffsetAnimationCurve;
 
 // Animator for fixed-destination scrolls, such as those triggered by
 // CSSOM View scroll APIs.
-class ProgrammaticScrollAnimator : private WebCompositorAnimationPlayerClient, WebCompositorAnimationDelegate {
+class ProgrammaticScrollAnimator {
     WTF_MAKE_NONCOPYABLE(ProgrammaticScrollAnimator);
     WTF_MAKE_FAST_ALLOCATED(ProgrammaticScrollAnimator);
 public:
@@ -36,14 +32,8 @@
     void tickAnimation(double monotonicTime);
     bool hasAnimationThatRequiresService() const;
     void updateCompositorAnimations();
-    void layerForCompositedScrollingDidChange(WebCompositorAnimationTimeline*);
+    void layerForCompositedScrollingDidChange();
     void notifyCompositorAnimationFinished(int groupId);
-    // WebCompositorAnimationDelegate implementation.
-    void notifyAnimationStarted(double monotonicTime, int group) override;
-    void notifyAnimationFinished(double monotonicTime, int group) override;
-
-    // WebCompositorAnimationPlayerClient implementation.
-    WebCompositorAnimationPlayer* compositorPlayer() const override;
 
 private:
     explicit ProgrammaticScrollAnimator(ScrollableArea*);
@@ -70,10 +60,6 @@
 
     void resetAnimationState();
     void notifyPositionChanged(const DoublePoint&);
-    void reattachCompositorPlayerIfNeeded(WebCompositorAnimationTimeline*);
-
-    OwnPtr<WebCompositorAnimationPlayer> m_compositorPlayer;
-    int m_compositorAnimationAttachedToLayerId;
 
     ScrollableArea* m_scrollableArea;
     OwnPtr<WebScrollOffsetAnimationCurve> m_animationCurve;